Multi-phase transformer

A multi-phase transformer comprising:

• a centrally-disposed first core, wherein the first core is non-rotatable;
• a plurality of second cores each provided outside the first core so as to constitute a loop-shaped magnetic path with respect to the first core, wherein the first core and the second core are engaged with each other;
• and
• a primary winding and a secondary winding wound on each of the second cores, wherein each of the second cores integrally consists essentially of:
• two radial leg portions each facing the exterior of the first core at one end and extending radially toward a center point of the multi-phase transformer, wherein the two radial leg portions are non-parallel with each other;
• and
• a continuous, unitary outer peripheral portion connecting the other ends of the two radial leg portions in a circumferential direction of the multi-phase transformer, wherein the other end of the one radial leg portion is connected to the one end of the outer peripheral portion in the circumferential direction and the other end of the other radial leg portion is connected to the other end of the outer peripheral portion in the circumferential direction,
• wherein the primary winding is wound around one of the radial leg portions of a second core and the secondary winding is wound around the other of the corresponding radial leg portions of the same second core as the primary winding;
• and
• further comprising a non-magnetic linear core fixation member provided between the outer peripheral portions of the adjoining second cores.